I would add to that, when using a hand priming unit such as the Lee or Hornady or RCBS and a few other brands; If you feel any extra resistance, or it feels weird--STOP and check it, it can mean it's cocked, or there are two in the hole (that one is usually a hard stop), or it's going in sideways (feels mushy, and gritty). Empty the tray on the tool. Take the case out, with shellholder if neccesary, and soak it in oil overnite and then you can remove it from the case.
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